POTENCY OF SOIL WATER IN MASINAM ISLAND BASED ON THE ROCK RESISTIVITY VALUE

Abstract

Groundwater is water that is contained in soil layers or rocks that are located below the soil
surface. The resistivity or geoelectric method is used to obtain an anomaly of material under the
surface using electrical properties. 2 Dimensional Geoelectric Measurements are carried out as
many as 5 Tracks. From the results of the analysis based on surface data, the resistivity
distribution value in the study area can be interpreted to obtain 3 rock packages with low, medium
and high types of resistance. If it has low resistance (smaller than 45 Ωm), the lithology in this
package is claystone, this layer is interpreted as not being able to store water and tends to easily
escape the water. While the value of the medium type of resistance (45 μm to 200 Ωm) has good
porosity. The lithology of this package is interpreted as sandstone. Lithology at high resistivity
values (greater than 200 Ωm), is interpreted as limestone. This limestone layer is presumed to
have undergone a karstification process and presumably, this layer has the potential to be a good
aquifer that can accommodate enough water and drain at a certain time.